When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Ask them which module they replaced in case it doesn't fix it. There are 3 main elements that could be bad. If they think speed is an issue I'd be asking more questions!
I had this message recently, followed by "service abs". They went away after a day. Then the serpentine belt started squeaking. Then the "service engine soon" light came on. Then the serpentine belt let loose. Now I have a new tensioner and belt.
I assume this fixed the problem but it's too early to tell.